This is our go-to birthday cake & a perfect cake for any party! I've adapted this by using my grandmother's recipe as well as Joy the Baker's recipe.
Preheat your oven to 350 degrees F. Butter & flour a half sheet pan (15x11) or prepare a cupcake pan.
Heat the butter, cocoa & water over medium heat & whisk until the butter is melted. Remove from the heat.
Whisk the eggs in one at a time. Add the sour cream & lastly, the vanilla.
Add the sour cream, then the vanilla.
Pour the batter into your greased pan or lined cupcake pan and bake for approximately 20 minutes.
Melt the butter, cocoa, and evaporated milk in a saucepan over medium heat.
If you like, you may add the nuts here.
As soon as the cake is finished, remove from the oven & top with the warm frosting. Serve when cooled, if you can wait that long!